$(function($){
    $.encrypt = $.encrypt ||{};
    $.extend($.encrypt , {
        /**
         * table初始化
         * @param userOptions
         */
        encode: function (val){
            return enCode(val);
        },
        decode:function (val) {
            return deCode(val);
        }
    });
});

var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

// 加密
function enCode(val) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;
    val = utf8ToEnCode(val);
    while (i < val.length){
        chr1 = val.charCodeAt(i++);
        chr2 = val.charCodeAt(i++);
        chr3 = val.charCodeAt(i++);
        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
        enc4 = chr3 & 63;
        if (isNaN(chr2)) {
            enc3 = enc4 = 64;
        } else if (isNaN(chr3)) {
            enc4 = 64;
        }
        output = output +
            _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
            _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
    }
    return output;
}

// 解密
function deCode(val) {
    var output = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;
    val = val.replace(/[^A-Za-z0-9\+\/\=]/g, "");
    while (i < val.length) {
        enc1 = _keyStr.indexOf(val.charAt(i++));
        enc2 = _keyStr.indexOf(val.charAt(i++));
        enc3 = _keyStr.indexOf(val.charAt(i++));
        enc4 = _keyStr.indexOf(val.charAt(i++));
        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;
        output = output + String.fromCharCode(chr1);
        if (enc3 != 64) {
            output = output + String.fromCharCode(chr2);
        }
        if (enc4 != 64) {
            output = output + String.fromCharCode(chr3);
        }
    }
    output = utf8ToDeCode(output);
    return output;
}

// method for UTF-8 encoding
function utf8ToEnCode(val) {
    val = val.replace(/\r\n/g,"\n");
    var utfText = "";
    for (var i = 0 ;i < val.length;i++){
        var char = val.charCodeAt(i);
        if (char < 128){
            utfText += String.fromCharCode(char);
        }else if ((char > 127) && (char < 2048)){
            utfText += String.fromCharCode((char >> 6) | 192);
            utfText += String.fromCharCode((char & 63) | 128);
        }else {
            utfText += String.fromCharCode((char >> 12) | 224);
            utfText += String.fromCharCode(((char >> 6) & 63) | 128);
            utfText += String.fromCharCode((char & 63) | 128);
        }
    }
    return utfText;
}

function utf8ToDeCode(val) {
    var string = "";
    var i = 0;
    var c = c1 = c2 = 0;
    while ( i < val.length ) {
        c = val.charCodeAt(i);
        if (c < 128) {
            string += String.fromCharCode(c);
            i++;
        } else if((c > 191) && (c < 224)) {
            c2 = val.charCodeAt(i+1);
            string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
            i += 2;
        } else {
            c2 = val.charCodeAt(i+1);
            c3 = val.charCodeAt(i+2);
            string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
            i += 3;
        }
    }
    return string;
}